Wheeled scraper



Aug. 1, 1939.

T. R'PAULSEN WHEELED SCRAPEH 2 Sheets-Sheet 1 Original Filed Jan. 9, 1937 ATTORNEYfi.

Aug; 1, 1939. r. R. PAUL$EN WHEELED SCRAPER' Original Filed Jan. 9, 1937 2 Sheets-Sheet 2 swam fiufseo z,

5y W11 r- Attornqs- "Reiuued Aug. 1, 1939 UNITED STAT S 21.170 p WHEELED semen Thomas B. Paulscn, South Milwaukee, Wlsi, as

signor to Bucyrus-Erie Company, 'South Milwaukee, Wis., a corporation of Delaware Original No. 2,106,759, dated mun Serial No. 119,790, January 9,

1, 193a, 1937. Application for reissue April 12, 1939, swarms. 267,522

'20 Claims. (01. 37-133) My invention relates to new and useful improvements in wheeled scrapers, and more particularly to that type of such scrapers, in which the bowl fills at its front'end and dumps at its rear end.

In devices of this sort, the bowl is pivoted, adjacent its rear'lower corners, to the carrying frame. A single hydraulic cylinder, or a pair of cylinders, mounted on the frame, serves to rotate the bowl about its pivot, in either direction from its neutral (1. e., carrying) position.

Each end of the bowl is provided with a closure, the front closure being known as the apron", and the rear closure being known as the ll end gate.

When the bowl tips downward into its digging position, the apron opens. When the bowl tips upward into itsdumping position, the end gate opens. s m But, although these functions have been attained in the prior art with a fair degreeof satisfaction, I have found it, desirable to effect the following improvements.

A new and similar linkage for the apron should be devised, so as to secure a wider opening of the apron while digging, and furthermore to cause the apron to so move yvhen opening and closing that the dirt will not interfere with these motioifi, and to relieve the bowl of the strain of supporting the weight of the loaded apron, and to eliminate rollers for opening the apron.

avoid their being damaged by dirt and stones. The end gate should be so positioned as to avoid jamming and wear due to interference by the dirt in the bowl,- and should be controlled without the use of sheaves, which tend to jam or become disengaged.

' The side beams should be so constructed and positioned as not to be interfered with y the ground.

And means should be provided for causing dry sand to fill the bowl, instead of merely piling up.

in front of the digging edge.

The attainment of these desiderata is the prin- 'cipal object of my invention.

In addition to myprincipal objects, above stated, I have worked out a number of novel and .useful details, which will be r a i y evidentas the description progresses.

I My invention consists'in the novel parts and in "the combination and arrangement thereof, which are defined in the appended claims, and of which one embodiment isexemplifled-in the accompanying drawings, which are hereinafter particularly described and explained." 1

Throughout the description, the same reference number is applied to the same-member or to similar member's. 5 Figures 1, 2, and 3 are side elevations of one form of my scraper, taken along the line 2. -'-2 of Figure 4 inside the wheels, showing apart ohthe frame in section. In Figure l the scraper isih, digging position; in Figure 2 it is in carrying posilil tion; and in Figure 3 it is in dumping position. Figure 4 is a plan view of the scraper of Figures 1, 2, and 3, in carrying position,

Figure 5 is a. vertical-longitudinal section of that scraper, taken along the lines 5-4 of Figure 15 4, except that Figure 5 is in digging position.

Figure 6 is a'front elevation, partially in section, of my anti-toggle catch and associated parts, taken along the lines 5-6 of Figure 2.

Referring now to Figure 4, we see-that II, II 20 are the side beams, and I2 is the cross beam, and I3 is the tongue, of the main frame of my scraper. The tongue l3, shown broken oil, extends to the tractor (not shown) which pulls my scraper. Wheels l4, support the frame. 25

Turning now more particularly to Figures 1, 2, and 3, we see that the bowl" I! is pivoted at It to the side beams II. The bowl has a digging edge l1.

Hydraulic cylinders ID are mounted in an ele- I vated position on the main frame, well forward The cylinders should be so positioned as to v and out of the way of the digging elements. The cylinders rotate the bowl I! about its pivot l6, by means of piston rods l9, rocker-arms 20 andconnecting-rods 21. The cylinders are fed from a source (not'shown) on the tractor,'by means of piping (not shown), and may be controlled, preferably from the driver's seat (not shown) in any convenient conventional manner (not shown) 40 Considering the carryingposition of Figure 2 as neutral, it will be seen that a retraction of piston-rod I8 will lower the bowl ii to the digging position shown in Figure l, and that a thrusting out of this piston-rod will raise the bowl as to the dumping position shown in Figure 3. v

The apron 221s; pivotally supported by the upper ends of bent rods '23, the lower ends of said rods being pivotally supported by the frame at II, the

same point of support as that which supports the 5 bowl. Theelbow of each bent" rod rests upon a rotatable stop 24, on the frame. This relieves the.

- bowl ofv having to carry the weight'of theapron and its contentsfifltwill be noted that the four sides of this stop are at successively'difl'erent distances from its center of rotation, thus aflording four different degrees of elevation for the. bent rod 23.

The notch in the upper edge of the bowl It bears against the pivot support of the apron 22, thus relieving the digging edge I! of some oi the weight of the apron and its contents in the dumping position.

Bars 25, pivoted at one end to the bowl and at the other end to the apron, serve (see Figure '1) to .rotate the apron 22 upwardly aboutits pivotal support on the bent-rod 23, when the bowl ll descends to its digging position; and (see Figure 3) to maintain the apron closed, when the bowl is lifted to its dumping position. It will be noted that the lower side of the apron, in opening and closing, moves in its own line, thereby preventing the dirt to be excavated from interfering with this opening and closing.

An end gate 26, pivoted to the'bowl at 21, is directly connected to the frame by chain 2|. When (see Figure 3) the bowl is lifted to its dumping position, the chain tautens, thus opening the end'gate to permit the contents of the 'bowl and apron to escape rearwardly.

' 28 is omitted, to avoid obscuring parts associated with the dog 4'', later to be, described.

It will be noted that theiside arms of the end gate 26 are disposed outside-of the sides oi. the bowl l5, thus preventing thejdir't the bowl from interfering with the openin'g'and closing of the gate, and from causing wear thereof,

It will be noted that the side beams ll, .by lacking a downward camber',at their rear ends, are kept well elevated, so that they will not become mired if the wheels sink into soft ground.

Turning now more particularly to Figure -5, we see that 28 are continuous chains, passing over upper tumblers III, and lower tumblers II. The upper tumblers are pivotally carried by the bowl, and the lower tumblers are pivotally carried by a ladder 32, which in turn is pivotally supported by the bowl at the same axis as the upper tumblers. The chains 1! carry slats II, or other means of kicking sand.

The shaft $4, to which the upper tumblers 30 are keyed, has keyed to it pinions 35, which engage gears 3i, also carried by the bowl l5. Keyed to rotate with'each gear 36 is a sprocket 31. r

The links 38, pivotally supported by side beams 'li, carrying friction'wheels 39 at their upper ends. Keyed to rotate with each of these friction wheels is a sprocket 40. Chains 4| drivably connect sprockets 4| to sprockets l1.

Through rods 42, levers 43, rods 44, levers 4i, rods 48, and control means (not shown) at the driver's seat, friction wheels 39 can be rocked forward into contact with the rubber tires of wheels l4. When in such contact, the clockwise motion of wheels i4; as the scraper moves forof the ladder 32, being floating free, rises; so that" the slats'always rest lightly on the top of the pile of sand. This free-floating is one of the important features of my invention,

This sand kicker of mine, although of, particular use in the combination in which it is here shown and described, would also be useful if the bowl" were the dipper of a power-shovel, or the bucket of'a dragline excavator, or any other similar digging instrumentality. y

Turning now to Figure 6, we see my optional means to prevent the apron from ever opening so far during digging that it will stick open when the bowl is raised to carrying position, although this is a relatively rare occurrence, and one which the dumping phase of the cycle would automatically correct anyway.

41 is a dog, pivoted on lugs 4.8, which project inwardly from the top of each side beam ll. As the bowl Ii descends from the dumping position of Figure 3 to the carrying position of Figure 2, the projection 4! on each bent rod 23 slips into the notch in the corresponding dog 41. Further descent of the bowl i causes a plate I! on its side wall to engage the leaf spring I, thus locking the bent rod securely in place during digging; and thus preventing the impact of the dirt, as it curls into the bowl, from forcing the apron so far open asto wedge it open, and even occasionally to rotate bars II so far counterclockwise that the apron will tend to remain stuck open rather than to close, even when the'bowi returns to carrying position. The stops might be omitted and the dogs 41 serve to perform their function. As the bowl rises again from the digging position of Figure l to the carrying position of Figure 2, the bent rods 23 are still held down by position of Figure 2,the side of the bowl I! disengages from, the leaf spring 5| and the compression spring 52 tilts the dog 41 to disengage the pro- .jection 49, thus permitting the attaining of the dumping position.

It should also-be noted that bent rod :1, if

raised too far, will come into contact with pivot 21, and thus this pivot alone would to some extent perform the functions of the catch mechanism just described.

Having now described and illustrated one form of my invention, I wish it to be understood that my invention is not to be limited to the specific form or arrangement of parts hereinbefore described, except insofar as the limitations are specified in the appended claims.

Iclaim: Y 0 1; In a scraper, the combination of: a frame; ground supports for said frame; a bowl pivoted at its rear end adjacent its bottom on the frame, for tilting movement in a vertical plane, said bowl being open at both front and rear, and having a digging edge at its front end; links pivoted adjacent the rear of the assembly; a

front apron, pivotally supported by the links;

eccentric rotatable stops on the frame, supporting the links, wherebyto support the apron when the 'bowl is in. its carrying position, and to re,- strain the. apron from accompanying the bowl when the latter istilted to its digging position: means'connecting the apron to the bowl in such a manner that the downward tilting of the bowl from its carrying to its digging position forces the apron to tilt upwardly; an end gate pivoted on the bowl; means, directly connecting the end gate to the frame, to open the gate when the bowl is tilted from its carrying position to' its dumping position; means carried by the frame for tilting the bowl; means to kick sand into the bowl; and means to prevent the apron from becoming wedged open during digging.

2. In a scraper, the combination of: a frame; ground supports for said frame; a bowl pivoted at its rear end adjacent its bottomon the frame,

for tilting movement in a vertical plane, said bowl being open at both front and rear, and having V aidigging edge at its front end; links pivoted adjacent the rear of the assembly; a frontapron,

pivotally supported by the links; stops on the frame, supporting the links, whereby to support the apron when the bowl is in its carrying position, and to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; means connecting the apron to the bowl in such a manner that the downward tilting of the bowl from its carrying to its digging position forces the apron to tilt upwardly; an end gate pivoted on the bowl; means,- directly connecting the end gate to the frame, to open the gate when the bowl is tilted" from its.carr-ying position to its dumping position; and means carried by the frame for tilting the bowl.

3. In a scraper, the combination of: a frame;

ground supports for said frame; a bowl-pivoted at its rear end adjacent its bottom on the frame, for tilting movement in -a vertical plane, said bowl being open at both front and rear, and

' having a digging edge at its front end; links pivoted adjacent the] rear of the assembly; a front apron, pivotally supported by the links, and havingsuch a bottom conformation that its bottom willmove in its own line when the apron opens; stops on the frame, supporting the links, whereby to support the apron when the bowl is in its carrying position, and to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; a pivoted link, connecting the apron to the bowl in such a manner that the downward tilting of the bowl from its carrying to its digging position forces the, apron to tilt upwardly; an end gate pivoted v on the bowl; means, directly connecting the end gate to the frame, to open the gate when the bowl is tilted from its carrying position to its dumping position; and means carried by the frame for tilting the bowl. r

4. In a scraper, the combination of a frame;

ground supports for said frame; a bowl pivoted at its rear end adjacent its bottom on the frame, for tilting movement in a vertical plane, said bowl being open at both front and rear;' and having a digging edge at itsfront and; links} pivoted adjacent the rear of the assembly; a;

' front apron, pivotally supported 'by' the links;

stops on the frame, supporting the links, whereby to support the apron when the bowl is in its carrying position, and" to restrain the pivotal support of the apron from accompanying the bowl when the latter is tilted to its digging position; an end gate pivoted on the bowl; means to open the gate when the bowl is'tilted from its carrying position to its dumping position; and meanscarried by the frame for tilting-the bowl.

5. In a scraper, ground supports for said frame; a bowl pivoted on the frame for tilting movement in a vertical plane, said bowl being open at both front and rear, and having a digging edge at its front end;

a front apron, pivotally supported by means which is independent of the bowl and which is in turn supported by the frame, in such manner that the apron accompanies the bowl when the latter is tilted to its dumping position; means to restrain the apron fromaccompanying the bowl when the latter is tilted to its digging the combination of: a frame;

position; an end gate pivoted on the bowl;

means to open the gate when the bowl is tilted from its carrying position to its dumping position; and means carried by the frame for tilting the bowl.

gate when the bowl ,is tilted from its carrying position to its dumping position; and means, including at least one fluid-power cylinder and cooperating linkage, carried by the frame for tilting the bowl, the cylinder being mounted above and well in advance of the digging edge of the bowl.

7. In a scraper, the combination of: a frame: ground supports for-said frame; a bowl pivoted on the frame for tilting movement in a vertical plane, said bowl being open at both front and rear, and having a digging edge at its-front end;

a front apron, pivotally supported by means which is independent of the bowl and which is in turn supported by the frame; means torrestrain the apron from accompanying the bowl when the latter is tilted to its digging position; an end gate, having side portions pivoted on the outside of the bowl; meansto open the gate when a the bowl is tilted from its carrying position to its dumping position; and means carried by the frame for tilting the bowl. v

8. In a scraper, the combination of; a frame;

ground supports for. said frame; a bowl pivoted on the frame for tilting movement in a vertical plane, said bowl being; open at both front and rear, and having a digging edge at its front end;

a front apron, pivotally supported by means which is independent of the bowl and which is in turn supported .by the frame; .means to restrain-the apron from accompanying ,-the bowl when the latter is tilted to its digging position;

.an'end gate pivoted on the bowl; means, directly fconnectingthe gate to the frame, to open the "gate when the bowl is tilted from its carrying position to its dumping position; and means car- *ried by the frame for tilting the bowl.

9. In a scraper, the combination of: a frame; ground supports for said frame; a bowl" pivoted on the frame for tilting movement in a vertical plane, said bowl being open at, both front and rear, and having a diggin edge at its front end;

a front apron, pivotally. supported by means which is independent of the bowl and which is inturnsupported by the frame; means to restrain the apron from accompanying the bowl when the latter is tilted to its digging position,

said means including an excentric stop; an end gate pivoted on the bowl; means to open the gate when the bowl is tilted from its carrying position to its dumping pos tion; means frame for tilting the bowl.

I0.,In a scraper, the combination of: a-frame:

ground supports for said frame; a bowl pivoted at its rear end adjacent its on the frame.

bowl being open at both front and rear, and hav ing a digging edge at its front end; links pivoted adjacent the rear of the assembly; a front apron,

carried by the for tilting movement in a vertical plane, said pivotally supportedby the links; means on the frame, supporting the links, whereby to support gate when the bowl is tilted from its carrying position ,to its dumping position; means carried by the frame for tilting the bowl; a catch, carried by the frame, for engaging at least one of the links when the -bowl is in digging position; and means to automatically lock the catch in this position, and to automatically release it for dumping.

11. In a scraper, the combination of: a frame; ground supports for said frame; a bowl pivoted at its rear end adjacent its bottom on the frame, for tilting movement in a vertical plane, said bowl being open at both front and rear, and havinga digging edge at its front end; links pivoted adjacent the rear of the assembly; a

front apron, pivotally supported by the links; I

means on the frame, supporting the links, whereby to support the apron when the bowl is in its carrying position, and to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; means connecting the apron to the bowl in such a manner that the downward tilting of the bowl from its carrying to its digging position forces the apron to tilt upwardly; an end gate pivoted on the bowl; means connecting the end gate to the frame, to open the gate when the bowl is tilted from its carrying position to its dumping position; means carried by the frame for tilting the bowl; a catch, carried by the frame, for engaging at least one of the links when the bowl is in digging position; and means to automatically lock the catch in this position, and to automatically release it for dumping, said last named means being a projection on the catch engaged by the side of the bowl.

12. In a scraper, the combination of: a frame; ground supports for said frame; a bowl pivoted on the frame for tilting movement in a vertical plane, said "bowl being open at both front-and rear, and having a-digging edge at its front end; a front apron, pivotally supported by means which is independent of the bowl and which is in turn supported by the frame; means to restrain the apron from accompanying the bowl when the latter is tilted to its digging position, and to positively close the apron as the bowl returns to its carrying position; an endgate pivoted on the bowl; means to open the gate when the bowl is tilted from its carrying position to its dumping position; and means carried by the. frame for tilting the bowl.

13. In a scraper, the combination of a frame;

ground supports for said fra e; a bowl pivoted at its rear end adjacent its bottom on the frame for tilting movement in a vertical plane, said bowl being .open at both front and rear and having a digging edge at its front end; links pivoted adjacent the rear of the assembly; a front apron supported by the links connections between the bowl and the apron; stops on the frame, supporting the links, whereby to support the apron when the bowl is in its carrying position, and in coaction with the above-mentioned connections "to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; an and gate pivoted on on the frame for tilting movement in a vertical plane, said bowl being open at both front and rear, and having a diggingedge at its front end; a front apron pivotally supported by means which is independent of the bowl and which is in turn supported by the frame; linkage operativeiy connecting the apron to the bowl, whereby the apron is opened when the bowl is tilted to its digging position; means carried by the frame for tilting the bowl; an end gate pivoted on the bowl; means to open the gate when the bowl is tilted from its carrying position to its dumping position; and means to prevent the apron from becoming wedged open during digsins- 15. In a scraper, the combination of: a frame; ground supports for said frame; a bowl pivoted on the frame for tilting movement in a vertical plane, said bowl having a digging edge at its front end; a front apron, pivotally supported by means which is independent of the bowl and which is in turn supported by the frame, in such manner that the apron accompanies'the bowl when the latter is tilted to its dumping position; means to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; and means carried by the frame for tilting the bowl.

16. In a scraper, the combination of a frame;

ground supports for said frame; a bowl pivoted at its rear end adjacent its bottom on the frame, for tilting movement in a vertical plane, said bowl having a digging edge at its front end; links pivoted adjacent the rear of the assembly; a front apron pivotally supported by the links; means on the frame, supporting the links, whereby to sup port the apron when the bowl is in its carrying position and to restrain theapron from accom-' panying the bowl when the latter is tilted to its digging position; means connecting the apron to the bowl in such a manner that the downward tilting of the bowl from its carrying to its digging position forces the apron to tilt'upwardly;

means carried by the frame for tilting th bowl; a catch carried by the frame, for engaging at least one of the links when the bowl is in digging position; and means to automatically lock the catch in this position, and to automatically release it for dumping.

18. In 'a scraper, the combination of: a frame; ground supports for said frame; a bowl pivoted on the frame for tilting movement in a vertical plane, said bowl having a digging edge at its front end; a front apron, pivotally supported by means winch is independent of the bowl and which is in turn supported by the frame; means to restrain the apron from accompanying the bowl when the latter is tilted to its digging position, and to positively close the apron as the bowl returns to its carrying position; and means carried by the frame for tilting the bowl.

19. In a scraper, the combination of a frame; ground supports for said frame; a bowl pivoted at its rear end adjacent its bottom on the frame for tilting movement in a vertical plane, said bowl having a digging edge at its front end; links pivoted adjacent the rear of the assembly; a front apron supported by the links; connections between the bowl and the apron; stops on the frame, supporting the links, whereby to support the apron when the bowl is in its carrying position, and in coaction with the above-mentioned, connections to restrain the apron from accompanying the bowl when the latter is tilted to its digging position; and means carried by the frame means which is independent of the bowl and which is in turn supported by the frame; linkage operatively connecting the apron to the bowl, whereby the apron is opened when the bowl is tilted to its digging position; means carried bythe frame for tilting the bowl; and means to prevent the apron from becoming wedged open during digging.

THOMAS R. PAULSEN. 

